Tips for reducing defects in mold processing


Author: MULAN –Plastic Molding Manufacturer

In order to improve the performance of the mold, many manufacturers will properly process their molds. Mold processing refers to the processing of forming and billet tools, and also includes shearing dies and die-cutting dies. It will also reflect the defects of processing, which will lead to the decline of mold performance. How to build the defects of mold processing? The following editor will explain to you. Reasonable selection and dressing of the grinding wheel, white corundum grinding wheel is better, its performance is hard and brittle, and it is easy to produce new cutting edges, so the cutting force is small, the grinding heat is small, and the medium particle size is used in the particle size, such as 46~ 60 mesh is better, and medium soft and soft (ZR1, ZR2 and R1, R2) are used in the hardness of the grinding wheel, that is, coarse-grained, low-hardness grinding wheels, and good self-excitation can reduce cutting heat. It is very important to choose the appropriate grinding wheel for fine grinding. For the high vanadium and high molybdenum conditions of the mold steel, it is more suitable to choose GD single crystal corundum grinding wheel. When processing cemented carbide and materials with high quenching hardness, diamond with organic binder is preferred. Grinding wheel, organic binder grinding wheel has good self-grinding property, and the roughness of the workpiece can reach Ra0.2μm. In recent years, with the application of new materials, CBN (cubic boron nitride) grinding wheel has shown a very good processing effect. Finishing on CNC forming grinders, coordinate grinders, and CNC internal and external cylindrical grinders, the effect is better than other types of grinding wheels.

During the grinding process, it is necessary to pay attention to dressing the grinding wheel in time to keep the grinding wheel sharp. When the grinding wheel is passivated, it will slide and squeeze on the surface of the workpiece, causing burns on the surface of the workpiece and reducing its strength. Rational use of cooling lubricating fluid plays three major roles of cooling, washing and lubricating, and keeps cooling and lubricating clean, so as to control the grinding heat within the allowable range to prevent thermal deformation of the workpiece. Improve the cooling conditions during grinding, such as using oil-immersed grinding wheels or internal cooling grinding wheels.

The cutting fluid is introduced into the center of the grinding wheel, and the cutting fluid can directly enter the grinding area to exert an effective cooling effect and prevent the surface of the workpiece from being burned.

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